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The researchers report that a thin layer of these polymers sprayed on a suspect surface can detect nitrogen-based explosives such as trinitrotoluene (TNT) after only 30 seconds. The polymers normally emit blue light when illuminated with ultraviolet radiation. The explosives absorb the electrons emitted by the illuminated polymers and quench the blue glow. The presence of as little as a picogram of explosive will cause this quenching, resulting in a dark spot on a film surrounded by the blue light from the polymers.


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